Set Includes 6 - Slow Flow Teat Features Hegen's super soft nipples are asymmetrical and off-center to allow for a natural upright feeding position at a 20 degrees tilt, similar to nursing from the breast Abcdef This minimizes the tilt that conventional baby bottles require, reducing the risk of milk back-flow which may cause mid-ear complications The design includes an elongated nipple to mimic a mother's breast and minimize nipple confusion, this re Hegen Fast Flow 6 Pk Teat-Kids